The plpy module also provides the
functions plpy.debug(msg), plpy.log(msg),
plpy.info(msg), plpy.notice(msg),
plpy.warning(msg), plpy.error(msg),
and plpy.fatal(msg). plpy.error and plpy.fatal actually raise a Python exception
which, if uncaught, propagates out to the calling query, causing
the current transaction or subtransaction to be aborted.
raise plpy.Error(msg) and raise
plpy.Fatal(msg) are
equivalent to calling plpy.error
and plpy.fatal, respectively. The
other functions only generate messages of different priority
levels. Whether messages of a particular priority are reported to
the client, written to the server log, or both is controlled by
the log_min_messages
and client_min_messages
configuration variables. See Chapter 18 for more information.

Another set of utility functions are plpy.quote_literal(string), plpy.quote_nullable(string), and plpy.quote_ident(string). They are equivalent to the
built-in quoting functions described in Section 9.4. They are useful when
constructing ad-hoc queries. A PL/Python equivalent of dynamic
SQL from Example
39-1 would be:

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